PDF malware analysis — malicious · 43619341154895d9

MALICIOUS

PDF

118.5 KB

MD5: d62cc889aea2e1706aff5f038e4ca0de SHA-1: 2e4fb6cacd8d675729c4102a2de07d1f25a229f0 SHA-256: 43619341154895d9044fd298ed970f777613f79f1b95eb39e5a017742e8aaedf

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file exhibits multiple high-severity heuristic firings related to JavaScript execution, including the use of eval() and a large comment-padded eval stager. ClamAV also detected it as 'Pdf.Exploit.Agent-36086'. The embedded JavaScript stream, although obfuscated, strongly suggests an attempt to download and execute a secondary payload, which is a common technique for initial access and further system compromise.

Heuristics 7

ClamAV: Pdf.Exploit.Agent-36086 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36086
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
Large comment-padded JavaScript eval stager high PDF_JS_LARGE_COMMENT_PADDED_EVAL

PDF JavaScript contains a very large stream padded with long random-looking block comments around String.fromCharCode and eval. This is an exploit-kit obfuscation shape used to bury a decoder and recovered stage inside noise, not normal PDF form automation.
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `93fb4a5dcbd3c94d9766c4dc7daf8bc4c04f4d79e674efbe65c7785864ad5aee`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627239 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 42 long base64-like blob(s).
`stream_001_off0001d66d.bin` `d695ccf880e6e8fcff7c3f0eca070edccc913cbeff824005c60f5437c2fea953`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D66D	300 bytes

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